USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
California · San Bernardino County
Colosseum Mine
Unconfirmed Gold Mixed Underground / Surface
Key facts
- State
- California
- County
- San Bernardino
- Development status
- Past Producer
- Mine type
- Mixed underground / surface
- Primary commodity
- Gold
- Verification
- Unconfirmed
- California DMR status
- CLOSED NO INTENT TO RESUME
- DMR report year
- 2025
Also known as
- Ivanpah Consolidated Mine
Mine Location
Approximate AreaDocumented underground workings
Source classification: Underground operation documented
Specific physical workings are not yet documented in discrete records.
Historical mapped workings
USGS historical topographic mapping. Features may no longer exist.
- 3 shaft symbols
- 33 adit symbols
View individual source records (2)
Every underlying record used to build the summary above, for research/verification use.
- Derived from MRDS oper_type (existing operation): Surface-Underground
- MRDS oper_type documents existing underground operation (dev_stat=Past Producer): Surface-Underground · oper_type
Verification
Unconfirmed
Source records support underground workings, but UndergroundMines has not yet independently verified this mine.
Why it's listed
Source records document both underground and surface mining.
History & operations
Historical record
- Development status: Past Producer
Operators / organizations
- Colosseum, Inc. (1993) · Historical operator · 1993
- Lac Minerals, Ltd. (1993) · Source-reported owner · 1993
Commodities & minerals
Reported minerals
- Andesite
- Barite
- Dolomite
- Gneiss
- Goethite
- Granite
- Iron
- Pyrite
View all 18 reported minerals
- Andesite
- Barite
- Dolomite
- Gneiss
- Goethite
- Granite
- Iron
- Pyrite
- Quartz
- Quartzite
- Sericite
- Shale
- Siderite
- Chalcopyrite
- Electrum
- Galena
- Gold
- Silver
Access & recent conditions
- Land
- unknown
Community reports
No community field reports yet.
I Visited This MineSources & evidence
USGS Historical Topographic Mine Features
Type: Historical mapped physical features
Dataset: DOI 10.5066/P9TAALR6
Supports:
- mapped shaft symbols (3)
- mapped adit symbols (33)
Historical mapped features may no longer exist.
California DMR Mines Online
Type: California state mining record
Record: 91-36-0026
Supports:
- operation status
- reporting year
A DMR match does not by itself prove underground workings.
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